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DISTRHO Plugin Framework
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  87. <div class="title">d_leakdetector.hpp</div>  </div>

  88. </div><!--header-->

  89. <div class="contents">

  90. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>

  91. <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * DISTRHO Plugin Framework (DPF)</span></div>

  92. <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (C) 2012-2014 Filipe Coelho &lt;falktx@falktx.com&gt;</span></div>

  93. <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>

  94. <div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any purpose with</span></div>

  95. <div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * or without fee is hereby granted, provided that the above copyright notice and this</span></div>

  96. <div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * permission notice appear in all copies.</span></div>

  97. <div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *</span></div>

  98. <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD</span></div>

  99. <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN</span></div>

  100. <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL</span></div>

  101. <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER</span></div>

  102. <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>

  103. <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>

  104. <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> */</span></div>

  105. <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>

  106. <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#ifndef DISTRHO_LEAK_DETECTOR_HPP_INCLUDED</span></div>

  107. <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#define DISTRHO_LEAK_DETECTOR_HPP_INCLUDED</span></div>

  108. <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div>

  109. <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &quot;../DistrhoUtils.hpp&quot;</span></div>

  110. <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div>

  111. <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;START_NAMESPACE_DISTRHO</div>

  112. <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div>

  113. <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment">// -----------------------------------------------------------------------</span></div>

  114. <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">// The following code was based from juce-core LeakDetector class</span></div>

  115. <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">// Copyright (C) 2013 Raw Material Software Ltd.</span></div>

  116. <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"></span></div>

  117. <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">/** A good old-fashioned C macro concatenation helper.</span></div>

  118. <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">   This combines two items (which may themselves be macros) into a single string,</span></div>

  119. <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">   avoiding the pitfalls of the ## macro operator.</span></div>

  120. <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">*/</span></div>

  121. <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">#define DISTRHO_JOIN_MACRO_HELPER(a, b) a ## b</span></div>

  122. <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#define DISTRHO_JOIN_MACRO(item1, item2) DISTRHO_JOIN_MACRO_HELPER(item1, item2)</span></div>

  123. <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment"></span></div>

  124. <div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">/** This macro lets you embed a leak-detecting object inside a class.\n</span></div>

  125. <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">    To use it, simply declare a DISTRHO_LEAK_DETECTOR(YourClassName) inside a private section</span></div>

  126. <div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">    of the class declaration. E.g.</span></div>

  127. <div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">    \code</span></div>

  128. <div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">    class MyClass</span></div>

  129. <div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">    {</span></div>

  130. <div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">    public:</span></div>

  131. <div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">        MyClass();</span></div>

  132. <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">        void blahBlah();</span></div>

  133. <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment"></span></div>

  134. <div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">    private:</span></div>

  135. <div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">        DISTRHO_LEAK_DETECTOR(MyClass)</span></div>

  136. <div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">    };</span></div>

  137. <div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">    \endcode</span></div>

  138. <div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">*/</span></div>

  139. <div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#define DISTRHO_LEAK_DETECTOR(ClassName)                                          \</span></div>

  140. <div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="preprocessor">    friend class DISTRHO_NAMESPACE::LeakedObjectDetector&lt;ClassName&gt;;              \</span></div>

  141. <div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor">    static const char* getLeakedObjectClassName() noexcept { return #ClassName; } \</span></div>

  142. <div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">    DISTRHO_NAMESPACE::LeakedObjectDetector&lt;ClassName&gt; DISTRHO_JOIN_MACRO(leakDetector_, ClassName);</span></div>

  143. <div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;</div>

  144. <div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#define DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(ClassName) \</span></div>

  145. <div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="preprocessor">    DISTRHO_DECLARE_NON_COPY_CLASS(ClassName)                      \</span></div>

  146. <div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="preprocessor">    DISTRHO_LEAK_DETECTOR(ClassName)</span></div>

  147. <div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>

  148. <div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">//==============================================================================</span><span class="comment"></span></div>

  149. <div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">/**</span></div>

  150. <div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">    Embedding an instance of this class inside another class can be used as a low-overhead</span></div>

  151. <div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">    way of detecting leaked instances.</span></div>

  152. <div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment"></span></div>

  153. <div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">    This class keeps an internal static count of the number of instances that are</span></div>

  154. <div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">    active, so that when the app is shutdown and the static destructors are called,</span></div>

  155. <div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">    it can check whether there are any left-over instances that may have been leaked.</span></div>

  156. <div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment"></span></div>

  157. <div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment">    To use it, use the DISTRHO_LEAK_DETECTOR macro as a simple way to put one in your</span></div>

  158. <div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">    class declaration.</span></div>

  159. <div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">*/</span></div>

  160. <div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">class</span> OwnerClass&gt;</div>

  161. <div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="classLeakedObjectDetector.html">   72</a></span>&#160;<span class="keyword">class </span><a class="code" href="classLeakedObjectDetector.html">LeakedObjectDetector</a></div>

  162. <div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;{</div>

  163. <div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="keyword">public</span>:</div>

  164. <div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="comment">//==============================================================================</span></div>

  165. <div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <a class="code" href="classLeakedObjectDetector.html">LeakedObjectDetector</a>() noexcept                            { ++(getCounter().numObjects); }</div>

  166. <div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <a class="code" href="classLeakedObjectDetector.html">LeakedObjectDetector</a>(<span class="keyword">const</span> <a class="code" href="classLeakedObjectDetector.html">LeakedObjectDetector</a>&amp;) noexcept { ++(getCounter().numObjects); }</div>

  167. <div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div>

  168. <div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="classLeakedObjectDetector.html#af4fd575fa5361ce5b01f65a635b1d6b3">   79</a></span>&#160;    <a class="code" href="classLeakedObjectDetector.html#af4fd575fa5361ce5b01f65a635b1d6b3">~LeakedObjectDetector</a>() noexcept</div>

  169. <div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    {</div>

  170. <div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        <span class="keywordflow">if</span> (--(getCounter().numObjects) &lt; 0)</div>

  171. <div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        {<span class="comment"></span></div>

  172. <div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment">            /** If you hit this, then you&#39;ve managed to delete more instances of this class than you&#39;ve</span></div>

  173. <div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">                created.. That indicates that you&#39;re deleting some dangling pointers.</span></div>

  174. <div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment"></span></div>

  175. <div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">                Note that although this assertion will have been triggered during a destructor, it might</span></div>

  176. <div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">                not be this particular deletion that&#39;s at fault - the incorrect one may have happened</span></div>

  177. <div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">                at an earlier point in the program, and simply not been detected until now.</span></div>

  178. <div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment"></span></div>

  179. <div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">                Most errors like this are caused by using old-fashioned, non-RAII techniques for</span></div>

  180. <div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment">                your object management. Tut, tut. Always, always use ScopedPointers, OwnedArrays,</span></div>

  181. <div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">                ReferenceCountedObjects, etc, and avoid the &#39;delete&#39; operator at all costs!</span></div>

  182. <div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment">            */</span></div>

  183. <div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;            d_stderr2(<span class="stringliteral">&quot;*** Dangling pointer deletion! Class: &#39;%s&#39;, Count: %i&quot;</span>, getLeakedObjectClassName(), getCounter().numObjects);</div>

  184. <div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        }</div>

  185. <div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    }</div>

  186. <div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;</div>

  187. <div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="keyword">private</span>:</div>

  188. <div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    <span class="comment">//==============================================================================</span></div>

  189. <div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    <span class="keyword">class </span>LeakCounter</div>

  190. <div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    {</div>

  191. <div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    <span class="keyword">public</span>:</div>

  192. <div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        LeakCounter() noexcept</div>

  193. <div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;            : numObjects(0) {}</div>

  194. <div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;</div>

  195. <div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;        ~LeakCounter() noexcept</div>

  196. <div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;        {</div>

  197. <div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;            <span class="keywordflow">if</span> (numObjects &gt; 0)</div>

  198. <div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;            {<span class="comment"></span></div>

  199. <div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment">                /** If you hit this, then you&#39;ve leaked one or more objects of the type specified by</span></div>

  200. <div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="comment">                    the &#39;OwnerClass&#39; template parameter - the name should have been printed by the line above.</span></div>

  201. <div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="comment"></span></div>

  202. <div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment">                    If you&#39;re leaking, it&#39;s probably because you&#39;re using old-fashioned, non-RAII techniques for</span></div>

  203. <div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment">                    your object management. Tut, tut. Always, always use ScopedPointers, OwnedArrays,</span></div>

  204. <div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment">                    ReferenceCountedObjects, etc, and avoid the &#39;delete&#39; operator at all costs!</span></div>

  205. <div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">                */</span></div>

  206. <div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;                d_stderr2(<span class="stringliteral">&quot;*** Leaked objects detected: %i instance(s) of class &#39;%s&#39;&quot;</span>, numObjects, getLeakedObjectClassName());</div>

  207. <div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;            }</div>

  208. <div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        }</div>

  209. <div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;</div>

  210. <div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        <span class="comment">// this should be an atomic...</span></div>

  211. <div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;        <span class="keyword">volatile</span> <span class="keywordtype">int</span> numObjects;</div>

  212. <div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    };</div>

  213. <div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div>

  214. <div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* getLeakedObjectClassName() noexcept</div>

  215. <div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    {</div>

  216. <div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;        <span class="keywordflow">return</span> OwnerClass::getLeakedObjectClassName();</div>

  217. <div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    }</div>

  218. <div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;</div>

  219. <div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <span class="keyword">static</span> LeakCounter&amp; getCounter() noexcept</div>

  220. <div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    {</div>

  221. <div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        <span class="keyword">static</span> LeakCounter counter;</div>

  222. <div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        <span class="keywordflow">return</span> counter;</div>

  223. <div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    }</div>

  224. <div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;};</div>

  225. <div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div>

  226. <div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="comment">// -----------------------------------------------------------------------</span></div>

  227. <div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;</div>

  228. <div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;END_NAMESPACE_DISTRHO</div>

  229. <div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div>

  230. <div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="preprocessor">#endif // DISTRHO_LEAK_DETECTOR_HPP_INCLUDED</span></div>

  231. <div class="ttc" id="classLeakedObjectDetector_html"><div class="ttname"><a href="classLeakedObjectDetector.html">LeakedObjectDetector</a></div><div class="ttdef"><b>Definition:</b> d_leakdetector.hpp:72</div></div>

  232. <div class="ttc" id="classLeakedObjectDetector_html_af4fd575fa5361ce5b01f65a635b1d6b3"><div class="ttname"><a href="classLeakedObjectDetector.html#af4fd575fa5361ce5b01f65a635b1d6b3">LeakedObjectDetector::~LeakedObjectDetector</a></div><div class="ttdeci">~LeakedObjectDetector() noexcept</div><div class="ttdef"><b>Definition:</b> d_leakdetector.hpp:79</div></div>

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